Use the following instructions to verify the power-up profile of TPS48110-Q1:
- Connect the EN/UVLO pin (TP3) to ground and INP (TP6) to ground.
- Set the input supply voltage VIN to 48 V and current limit of 10 A.
- Enable the power supply.
- Now, enable the EN/UVLO to HIGH to observe the start-up profile of BST, GATE and SRC when INP = GND as shown in Figure 5-2.
- Now, disable the controller by making EN/UVLO = LOW.
- Connect INP (TP6) to VAUX to set INP as HIGH.
- Now again, enable the EN/UVLO to HIGH to observe the start-up profile of BST,
GATE, and SRC when INP = HIGH as shown in Figure 5-3.
Figure 5-2 Start-Up Profile of Bootstrap Voltage for INP = GND
Figure 5-3 Start-Up Profile of Bootstrap Voltage for INP = HIGH